adj. devoid of intelligence

adj. not using intelligence

adj. insanely irresponsible; "an idiotic idea"

adj. having a mental age of between eight and twelve years

adj. dull and tiresome but with pretensions of significance or originality; "bromidic sermons"

adj. not consistent with or using reason; "irrational fears"; "irrational animals"

adj. without a basis in reason or fact; "baseless gossip"; "the allegations proved groundless"; "idle fears"; "unfounded suspicions"; "unwarranted jealousy"

adj. suffering from severe mental illness; "of unsound mind"

adj. (of theories etc) incapable of being defended or justified

adj. inconsistent with reason or logic or common sense; "the absurd predicament of seeming to argue that virtue is highly desirable but intensely unpleasant"- Walter Lippman

adj. lacking interest or significance; "an insipid personality"; "jejune novel"

adj. lost in thought; showing preoccupation; "an absent stare"; "an absentminded professor"; "the scatty glancing quality of a hyperactive but unfocused intelligence"

adj. aimlessly drifting

adj. lacking import; "a pointless remark"; "a life essentially purposeless"; "senseless violence"

adj. (of especially persons) lacking sense or understanding or judgment

adj. not marked by the use of reason; "mindless violence"; "reasonless hostility"; "a senseless act"

adj. marked by lack of attention or consideration or forethought or thoroughness; not careful; "careless about her clothes"; "forgotten by some careless person"; "a careless housekeeper"; "careless proofreading"; "it was a careless mistake"; "hurt by a careless remark"

adj. lacking mental capacity and devoid of subtlety

adj. mentally sluggish

adj. not prudent or wise; "very imprudent of her mother to encourage her in such silly romantic ideas"; "would be imprudent for a noneconomist to talk about the details of economic policy"- A.M.Schlesinger

adj. incongruous;inviting ridicule; "the absurd excuse that the dog ate his homework"; "that's a cockeyed idea"; "ask a nonsensical question and get a nonsensical answer"; "a contribution so small as to be laughable"; "it is ludicrous to call a cottage a mansion"; "a preposterous attempt to turn back the pages of history"; "her conceited assumption of universal interest in her rather dull children was ridiculous"

adj. showing or resulting from lack of judgment or wisdom; "an unwise investor is soon impoverished"

adj. very foolish; "harebrained ideas"; "took insane risks behind the wheel"; "a completely mad scheme to build a bridge between two mountains"

adj. poorly conceived or thought out; "an ill-conceived plan to take over the company"

adj. lacking sense or discretion; "his rattlebrained crackpot ideas"; "how rattlepated I am! I've forgotten what I came for"- Glenway Westcott